Product Details
Mu-metal Shielding Alloy FeNi Soft Magnetic with very High
Permeability
A-ONE ALLOY supplies Mu-metal in forms of strip, sheet, plate,
wire, rod, round bar, forging, tube, pipe, capillary as well as
machined parts per customers' spec& drawing.
Mumetal is a FeNi soft magnetic alloy with very high permeability.
Mumetal is used for shielding sensitive electronic equipment
against static or low-frequency magnetic fields.
The name came from the Greek letter μ(mu) which represents
permeability in physics and engineering formulae.
Mu-metal is considered to be ASTM A753 Alloy 4(UNS N14080) and is
composed of approximately 80% nickel, 5% molybdenum, small amounts
of various other elements such as silicon, and the remaining 12 to
15% iron.
Chemical composition
Element | C | Mn | Si | P | S | Cr | Ni | Mo | Co | Cu | Fe |
Weight (%) | 0.05 max. | 0.80 max. | 0.50 max. | 0.02 max. | 0.01 max. | 0.30 max. | 79.0~82.0 | 3.5~6.0 | 0.50 max. | 0.30 max. | Balance |
Mu-metal typically has relative permeability values of
80,000–100,000 compared to several thousand for ordinary steel. It
is a soft magnetic alloy. Mu-metal has low magnetic anisotropy and
magnetostriction, giving it a low coercivity so that it saturates
at low magnetic fields. This gives it low hysteresis losses when
used in AC magnetic circuits. Other high-permeability nickel–iron
alloys such as permalloy have similar magnetic properties;
mu-metal's advantage is that it is more ductile and workable,
allowing it to be easily formed into the thin sheets needed for
magnetic shields.
Mu-metal objects require heat treatment after they are in final
form—annealing in a magnetic field in hydrogen atmosphere, which
increases the magnetic permeability about 40 times. The annealing
alters the material's crystal structure, aligning the grains and
removing some impurities, especially carbon, which obstruct the
free motion of the magnetic domain boundaries. Bending or
mechanical shock after annealing may disrupt the material's grain
alignment, leading to a drop in the permeability of the affected
areas, which can be restored by repeating the hydrogen annealing
step.
Application
- Electric power transformers, which are built with mu-metal shells
to prevent them from affecting nearby circuitry.
- Hard disks, which have mu-metal backings to the magnets found in
the drive to keep the magnetic field away from the disk.[citation
needed]
- Cathode-ray tubes used in analogue oscilloscopes, which have
mu-metal shields to prevent stray magnetic fields from deflecting
the electron beam.
- Magnetic phonograph cartridges, which have a mu-metal case to
reduce interference when LPs are played back.
- Magnetic resonance imaging equipment.
- The magnetometers used in magnetoencephalography and
magnetocardiography.
- Photomultiplier tubes.
- Vacuum chambers for experiments with low-energy electrons, for
example, photoelectron spectroscopy.
- Superconducting circuits and especially Josephson junction
circuits.
- Fluxgate magnetometers and compasses as part of the sensor.
Company Profile
Suzhou Xunshi New Material Co., Ltd (refered as Xunshi afterwards) is a professional supplier of high performance alloys. Our factory
is specialized in manufacturing Nickel alloys & Cobalt alloys
for 10+ years,with a company mission to provide a high quality, reliable
source for precision alloys, high temperature alloys and stainless
steels in both pilot run and mass production. We are professionally
manufacturing materials with unique features, which are then used
in aerospace, military, electronics, marine, petroleum and
petrochemical industries.
Base on “Quality-oriented, Leading Technology, Continuous
Improvement, Customer Satisfaction”, we believe Xunshi could be
your best supplier.
Product Scope of Xunshi
· Inconel
· Hastelloy
· Incoloy
· Monel
· Nimonic
· Nitronic
· Haynes
· Special Stainless Steel
· Soft Magnetic Alloy
· Permanent Magnetic Alloy
· Elastic Alloy
· Controlled Expansion Alloy
· Magnetostrictive Material
Services of Xunshi
· Material selection
· Non-standard product research and pre-production
· Hard to find material sourcing
· Cutting/splitting
· Precision machining
· Heat treatment
· Customized Packing
· Logistics service
Advantages of Xunshi
· Experienced in industry
· Quality control system
· Authorized Certificates
· Guaranteed delivery and quality
· Customers from 30+ countries trust us
Xunshi is engaged in introducing China-origin high performance alloys to
the entire world. Choose Xunshi, choose high performance.